Bowed expander roll



Sept. 27, .1938. c. w. SHUTE BOWED EXPANDER ROLL Filed Feb. 1, 1937Patented Sept. 27, 1938 uNirr.

This invention is expanders of the Mycock srar BOWED EXPANDER ROLLCharles W. Frederick vLeyland Machinery Company,

Application February 1,

11 Claims.

an improvement in bowed type for cloth and other continuous webmaterial, and in particular relates to the bobbins which are mounted ona stationary curved shaft, to form an articulated curved roll usuallyrotated by drawing the web material over it, the outward component oftravel of the surfaces of the bobbins asthey rotate in the and

planes oblique to utilized. to open travel of the material being expandthe sheet of web material in both directions away from its middle line.

The bobbins comprising each roll are interlocked or clutched. together,or else fixed tightly in a common rubber their turning in unison, so

tube or covering, to ensure as to attain uniform spreading action acrossthe width of the material and also to avoid bobbins or between excessivewear between the the bobbins and the cover.

Hitherto these clutches have been unsuited for use in rubber coveredrolls, and when used in bare rolls have alway of the bobbins, being sbeen of the full diameter made as by forming a rectangular recess at twoor more spaced points in the cylindrical cloth engaging of the bobbins,so

surface at the ends that the projections thus formed on the end of eachbobbin will fit into the corresponding recesses 'made in theclothengaging surface at the end of the adjacent bob bin.

In use, these expander rolls are subjected to very considerable strainsand vibrations, with the result that the co-engaging driving shoulderson the clutches thus formed on adjacent bobbins of these bars,all-metallic expander rolls pound burrs onto the These burrs prick theupper edges of the clutches. cloth as drawn around the rolls, makingfine perforations both by spreading the yarns and by cutting andbreaking the yarns themselves, and otherwise damaging the quality of thefabric.

A further drawback is that on starched goods,

the edges of the driving shoulders of the clutches press into and leaveobjectionable marks on the surface of the fabric.

In addition, the exposed bins in this outside type of clutch strive topull the same longitudinal elements or warps of the cloth simultaneouslyclosely spaced interva in opposite directions at is in the length of thecloth Shute, Boston, '1. Walsh, doing business as Thomas Mass, assignorto Boston, Mass.

1937, Serial No. 123.43%

in the zone where the cloth gently traveling This is objectionable as itorrica overlaps these diversurfaces of the two bobbins.

tends to pull the warps out of their intended straight-line extent inthe fabric.

As the bobbins are annular ridges of saw-t0oth profile over the entirecloth-engaging surface, with a rake toward the ends of the roll, toenhance and hence the spreading into the peripheral teeth the frictionalgrip commonly made with action-of the rolls on the fabric, the warpswhich are sunk by tension of two adjacent clutch dogs of a pair ofbobbins are subjected to a wrenching and shearing ing action where thedrivwhat less than might otherwise be desired for most effectiveexpanding, in order to avoid too harsh and distorting action on thewarps Further, there is a tendency to pinch the between the ends of thebottoms of the cloth dogs of this type and the corresponding recesses inthe adjacent bobbin. Also, this type of outside clutch permits chewed-upfragments of the felt greaseretaining collar, used inside the bobbins,to escape and stain the cloth.

To remedy these shortcomings in the standard Mycock type of bare tooffer advantages metallic expander likewise obtainable in. the

rolls, and

case of rubber covered rolls, my invention comprises the provision ofimproved bowed expander :30

bobbins having the devices which clutch adjacent bobbins together torotate in unison wholly below or of the bobbins, or within ripheralsurfaces which the rubber cover in the In its preferred form; diameterclothor coverbobbin contains no recess cut disposed within theweb-engaging. surfaces corresponding pev the interior of the engage 7case of covered rolls.

the cylindrical or fullengagingsurface of the inits ends nor protrusionsfrom such ends. Instead, the recesses and projections are formed on andin the endsof each bobbin at a lesser radius than the cylindrical orperipheral so that when put together inside the surface of the surfaceof the bobbin, the clutches are-wholly roll and shielded thereby fromall contact with the cloth. Thus any burring which occurs on the clutchdogs cannot injure the cloth, no marking, shearingfeffects;

or distortion of the warps shoulders of can arise at the driving theclutches, there are'no open re- 7 cesses to collect lint,'starch,and-water, groundup greasy fragments'fromthe felt washer are impeded intheir escape, can be made as sharp a and the annular teeth s desired,and there is faces of the clutch dogs meet, which limits 1 the depth andsharpness of the teeth to somepinch the cloth at the ends of are as willbe made plain herein.

An illustrative embodiment of the invention is shown in the accompanyingdrawing, in which Fig. 1 shows a portion of the curved shaft atmid-width of a bare-roll bowed expander, with two of the improvedbobbins thereon and shown in section, illustrating the manner of theirinterengagement, the curve of the shaft being exaggerated.

Fig. 2 is a side view of one of the improved bobbins, partly brokenaway.

Figs. 3 and 4 are end elevations of opposite ends of the bobbin of Fig.2.

The novel bobbin comprising my improved bowed expander roll shown inFigs. 2, 3 and 4 has as usual in the case of bare expander rolls aworking surface of generally cylindrical shape, equipped with sharpannular ridges or teeth I having a rake or slant all in one direction.This cylindrical surface extends for the full length of the entiresurface of the bobbin which engages the cloth, without any projectionsor recesses in its unbroken terminal peripheral edges or rims at eitherend. At locations wholly below the ridged cloth-engaging surface thereare formed on the ends of each bobbin projecting integral clutch fingersor dogs 3, of segmental shape and concentric with the axis of thebobbin,

of the bobbin. These dogs 3 may be of any suitable or desired number andextent in a direction around the axis, preferably having an extent equalto the spaces or intervals left between the several dogs and thus beingequally spaced about the circuit of each end. The end of each bobbin isrecessed as indicated at 5 between each two projecting dogs 3, so thatwhen put together Fig. 1 practically the entire length of each dog 3 isreceived within and shielded by the corresponding recess 5 in the end ofthe adjacent bobbin. The material of the end is also removed just insidethe dogs 3 to the same depth as the dog-receiving recesses 5, to form anannular space 8 extending all the way around the circuit of the end, inwhich cylindrical. felt collars 9 are located, and to leave a hub II inwhich is fixed a bushing 3 to bear against the surface of the shaft. Thefelt collar 9 seats simultaneously In the bottom of the space 8 of bothbobbins when in working relation, to prevent the escape of dirt andlubricant outwardly; from the bearing surfaces.

The parts are fitted so that the opposing rims l5 of the adjacentbobbins will not be allowed to come into contact with or approach veryclosely to each other at the concave side of the shaft, or at any pointwhere engaged by the rotation so that the between the oppositePreferably, as shown in Figs. 1 and 2, this is accomplished throughextending the hubs l I axially outward far enough to bring the flangesof the bushings B into bearing engagement with each other before therims [5 can engage each other. This may also be attained by making themutually interlocking dogs 3 and their corresponding recesses of suchlength and depth that the dogs bottom in the recesses and hold the rimsI5 apart at the concave side'of the roll.

on the curved shaft 1 as in The dogs 3 have their exterior surfacestapered slightly, to facilitate their entry into the recesses of eachadjacent bobbin, and to provide for the disalignment of the axes of thebobbins; similarly, the driving shoulders I! of each-dog are given aslight and equal taper toward each other.

Application of the inventions principle of putting the clutches belowand Withinthe periph- The teeth I are omitted from the bobbin, which mayhave either a smooth cylindrical surface to engage the interior of therubber covering or any of the known polygonal, ridged, or ribbedsurfaces designed to hold the cover against rotation with respect to thebobbins. vious, the cover is relieved of the wrenching strains of havingto drive individual lagging bobbins whose bearings run dry or bind onthe curved shaft, since interlocking bobbins may thus' be used insidethe cover without the clutches pinching and chewing the inside of thecover and wedging the torn-off bits of rubber in the clutch form lumpsdistorting the exterior surface of without departing tion as expressed'do not wish to be shown, or to the but from the scope of the inveninthe claims. Therefore, I limited to the particular form details ofconstruction thereof,

cloth between adjacent bobbins.

3. In a bowed expander for web 4. In a bowed expander for web materials,in

/ M g nder bob- 1 H m] I mlhionii Wham

